For prototyping / mockup needs, I want an iPad app where it's possible to draw, save and drop 'templates' on a canvas.
Something similar to balsamiq mockups, where there is a collection of components that can be placed on canvas, but with the ability to create my own components by drawing and saving for later reuse.

2 Answers
2

The best app that comes to mind is Sketchbook Pro for the iPad. It's like a simplified version of Photoshop where it has brushes and a lot of features that are at the mercy of your fingertips. I have it, and it's great for prototyping / making concept art real quick.

Have you seen App Cooker? It lets you create your own components for your mockup. (However, it is not clear from their webpage whether user-created content is available for every mockup, or if it is only present in the project where you created it.)